Screw Wash Press in Stainless Steel

SWP

• Washing of fecal content in screenings • Dissolvable organic content are brought back to the treatment process• Major weight and volume reduction of screenings

• Minimization of odour problems and disposal costs• SWP achieves DS content of 40-60% • High finish guarantees a long life time

Main areas of use and features

SWP SCREW WASH PRESS

AdvantagesReturn of washed out organic contents to the treatment pro-

cess and increase of the DS content of the screenings. The

combination of Meva Screw Wash Press and Meva Counter

Pressure Screw results in a product optimal for incineration.

Area of useDue to the increased use of fine screens, the amount of

screenings separated from waste water is constantly increasing.

The amount of screenings leads to increased odour problems

and disposal costs.

Using Meva SWP to wash the fecal content and reducing the

screenings volume is advantageous for both environmental

and economical reasons.

Meva SWP is well suited for both smaller and larger waste

water treatment plants. It is a compact and cost efficient unit,

which has proven good functionality due to its simple and

functional design.

Combined with a Meva fine screen, the result is an

optimal screenings unit. Feeding to the Meva SWP can also be

done via coarse screens, sieves or transportation equipment

such as spiral or belt conveyors.

FunctionScreenings are fed forward by a slowly rotating screw. Wash

water is added in the wash/press zone, where dissolved

materials and water are pressed out and brought back to the

waste water treatment process.

The working cycle is adjusted by the control system with

regard to the composition of the screenings. The detention

time in the press can be prolonged by mounting a counter pres-

sure screw after the SWP. This will result in efficient washing

and higher DS content.

The press transports the washed and pressed screenings to a

container via a CPS, pipe system or a spiral conveyor. Meva

SWP is designed with double troughs making it very “torque

resistant” for heavy operations with screenings of high DS con-

tent. The high “torque resistance” enables the SWP to be de-

livered with a large inlet opening. Further, the double trough

allows for the inner pipe to be fully perforated and, thereby,

allowing maximal dewatering.

The screw operates close to the inner pipe, which results in

high drainage. A robust axial bearing and a worm gear absorb

the forces from the press. The press zone is easily accessible

through a hatch.

SWP is mainly manufactured in stainless steel. The screw and

wear parts are manufactured in highly durable steel.

Meva Screw Wash Press SWP:

• Washing of fecal content in screenings

• Dissolvable organic content are brought back to the

treatment process

• Major weight and volume reduction of screenings

• Minimization of odour problems and disposal costs

• SWP achieves DS content of 40-60%

• High finish guarantees a long life time

Meva Screw Wash Press - Compact and easy to operateWashing and dewatering

Washed and dewatered screenings

Nordic Water Products AB, Sisjö Kullegata 6, SE-421 32 Västra Frölunda, SWEDENTel: +46 31 748 54 00, fax: +46 31 748 54 10. Email: info@nordicwater.com. www.nordicwater.com

SWP 15 SWP 20 SWP 25 SWP 30 SWP 40

S1

10

5-E

n-1

20

4

Capacity (m³/h)* 0.5-1 1-1.5 1.5-2 2-3 3-7.5

Connecting flange DN 150 DN 200 DN 250 DN 300 DN 400

(A) Inlet opening 300-600 300-3000 300-3000 300-3000 400-1200

(B) Total length 1010-1310 1370-4070 1375-4075 1450-4150 1760-2560

(C) Height 290 330 380 430 635

(D) Width 280 340 405 450 600

(E) Inlet width 200 230 300 350 450

(F) Wash zone 460 650 650 725 900

Measurements in millimeter.

* Wet material, capacity depending on degree of filling.